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A mirror of the official Linux kernel repository just in case
0405e12811
If a function name is greater than 63 characters long, xmon command may not find them. For example, here is a test that executed an illegal instruction in a kernel function and one of call stack function has a name greater than 63 characters long: cpu 0x0: Vector: 700 (Program Check) at [c00000000a6577e0] pc: c0000000001aacb8: check__allowed__function__name__for__symbol__r4+0x8/0x10 lr: c00000000019c1e0: check__allowed__function__name__for__symbol__r1+0x20/0x40 sp: c00000000a657a80 msr: 800000000288b033 current = 0xc00000000a439900 paca = 0xc000000003e90000 irqmask: 0x03 irq_happened: 0x01 ..... [link register ] c00000000019c1e0 check__allowed__function__name__for__symbol__r1+0x20/0x40 [c00000000a657a80] c00000000a439900 (unreliable) [c00000000a657aa0] c0000000001021d8 check__allowed__function__name__for__symbol__r2_resolution_symbol+0x38/0x4c [c00000000a657ac0] c00000000019b424 power_pmu_event_init+0xa4/0xa50 and when executing a dump instruction (di) command for long function name, xmon fails to find the function symbol: 0:mon> di $check__allowed__function__name__for__symbol__r2_resolution_symbol unknown symbol 'check__allowed__function__name__for__symbol__r2_resolution_symb' 0000000000000000 ******** This is because in scanhex(), tmpstr loop index is checked only for a upper bound of 63. Fix it by replacing the upper bound value with (KSYM_NAME_LEN-1). With fix: 0:mon> di $check__allowed__function__name__for__symbol__r2_resolution_symbol c0000000001021a0 3c4c0249 addis r2,r12,585 c0000000001021a4 3842ae60 addi r2,r2,-20896 c0000000001021a8 7c0802a6 mflr r0 c0000000001021ac 60000000 nop ..... Reported-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> Closes: https://lore.kernel.org/linuxppc-dev/CANiq72=QeTgtZL4k9=4CJP6C_Hv=rh3fsn3B9S3KFoPXkyWk3w@mail.gmail.com/ Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20240826064217.46658-1-maddy@linux.ibm.com |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
fs | ||
include | ||
init | ||
io_uring | ||
ipc | ||
kernel | ||
lib | ||
LICENSES | ||
mm | ||
net | ||
rust | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.editorconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
.rustfmt.toml | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the reStructuredText markup notation. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.